Reading Device Illumination Diffusion Plates
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Solution Overview
Problem
Conventional reading devices face challenges in reducing illumination unevenness, which affects the accuracy of image acquisition, particularly when using infrared and visible light sources.
Innovation Solution
The reading device incorporates a housing with a transparent reading window and diffusion parts, including light-transmitting diffusion plates and reflection plates, to diffuse infrared and visible light, ensuring even illumination and reducing the need for a mirror to focus light, thus minimizing illumination unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a mirror is used to focus light on the imaging device, then light focusing capability is improved, but illumination unevenness increases and device complexity increases
Solution Approach 1:
The patent introduces diffusion plates as intermediary components between the light source and the reading surface. These diffusion plates scatter the light from the LED sources to provide uniform illumination across the entire reading area, eliminating the need for mirrors while achieving even lighting distribution.
Solution Approach 2:
The patent replaces the mechanical optical system (mirror-based focusing) with a diffusion-based illumination system. By using diffusion plates to scatter light, the system achieves uniform illumination without requiring precise optical alignment or reflective surfaces, thereby reducing complexity and improving illumination uniformity.
2Manufacturing precision
If light sources are disposed close to the mounting surface, then illumination unevenness is reduced, but device compactness is limited
Solution Approach 1:
The patent transitions from a single-plane illumination arrangement to a three-dimensional illumination architecture. By positioning light sources at the bottom surface and using diffusion plates that extend vertically, the system achieves uniform illumination while maintaining vertical compactness, effectively utilizing spatial dimensions to resolve the contradiction.
Solution Approach 2:
The diffusion plates serve as intermediaries that allow light sources to be positioned at the bottom surface while still achieving uniform illumination on the reading surface. The diffusion plates scatter the light downward and outward, enabling the light sources to be located away from the reading surface without compromising illumination uniformity.
3Manufacturing precision
If diffusion plates are added to diffuse light, then illumination evenness is improved, but device complexity increases
Solution Approach 1:
The patent uses diffusion plates with specific optical properties to create homogeneous light distribution. The diffusion plates are designed to scatter light uniformly across the reading surface, achieving even illumination with simple, homogeneous components rather than complex optical systems.
Solution Approach 2:
The patent replaces complex optical systems (mirrors, lenses, adjustable mechanisms) with simple diffusion plates. These diffusion plates achieve uniform illumination through their inherent light-scattering properties, eliminating the need for precise mechanical alignment and complex optical design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances reading accuracy by achieving even illumination, reducing the impact of high-intensity light sources and allowing for a compact design without the need for a mirror, thereby improving image quality and device size.
Implementation Method 1
The first diffusion part diffuses the infrared light from the first irradiation part
Implementation Method 2
The first diffusion part is made up of a light-transmitting first diffusion plate and a light-transmitting second diffusion plate
Data Source
AI summary
The reading device of the present disclosure includes a housing, a first irradiation part, an imaging device, and a first diffusion part. The housing has an opening in an upper portion with a transparent reading window member. The first irradiation part emits an infrared light. The imaging device is disposed on a bottom portion such that an optical axis is directed to a reading window member. The first diffusion part is disposed on a left side wall connecting the upper and bottom portions. The first diffusion part diffuses the infrared light. The first diffusion part is made up of a light-transmitting first diffusion plate and a light-transmitting second diffusion plate. The first diffusion plate is disposed on the bottom surface side and inclined toward the upper portion. The second diffusion plate is disposed on the upper surface side and inclined toward the bottom portion.